Continuity mistake: In the last dance scene, in the rain, when the men are starting dancing alone, you see Smiley with a T-shirt (the one with the red hat). However, a few seconds after, you see him wearing a white sweater and it keeps shifting between shots. (01:26:25 - 01:27:00)
Continuity mistake: In the last dance scene the kid with the tan hat and red jacket slings the jacket around throws it into the audience. But throughout the whole dance, it is on and then off again.
Continuity mistake: In the scene where the MSA crew have just been rehearsing in the school, they walk out and see Sophie. The white top she is wearing under her pink one is a halter top and you can just see the strap of it going around the back of her neck. Later on in the next scene of the barbecue at Missy's house, the white top under the pink one changes into a white vest top and you can see the straps going over each shoulder.
Continuity mistake: Near the end of the movie when they start dancing outside. The dancer with a striped shirt, white hat, and red hoodie starts in the rain with the hoodie on, then he takes it off and whips it on the ground. He then has it on and off at different times in the sequence.